Sounds to me like you've gained a few pounds, mate.
Solution: Get a bigger waste size and wear a belt.
4 of 6 people found the following review helpful
Be sure you want work pants and need work pants; because no frills or comfort,
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This review is from: Carhartt Men's Twill Work Pant B290 (Apparel)
I ordered these hoping for a comfortable and durable pair of pants for work (not work pants per se.). Wow they seem like they will last awhile I am use to 'dress pants' from big box stores. Even the least expensive of those have a much more comfortable waist band with a lot of give.
These also don't seem that breathable. Carhartt makes fine prodcuts. If you want work pants with a no give waist and no frill material these are fine. If your workplace demands it, then consider these. If your work place is an office, I would not recommend these. If you want any kind of comfort waistband which is what I am use to on pants priced like these, stick with the generic big box brand offerings.